天城恭一（速水もこみち）の過去を知った佐藤唯（松井愛莉）は、その重さに耐えかね、思わず藍田航之郎（平岡祐太）を頼る。ドッグランで藍田の愛犬・スヌープを遊ばせながら、複雑な胸の内を聞いてもらう唯。そこへ、藍田に急患の知らせが入る。藍田は病院に急行し、スヌープは唯が預かることに。 その晩、藍田がスヌープを引き取りに唯のアパートに現れる。玄関を開けた瞬間、藍田は唯をいきなり“床ドン”し…！？一方、天城に強烈なモーションをかけ続ける三島冴（田中道子）の前には、捨てられた男、ユウキ（笠松将）が現れる。かつての遊び相手を冷たくあしらう冴。その行動が、とんでもない災いを引き起こす！！
Yui Sato (Airi Matsui), who knew the past of Kyoichi Amagi (Mokomichi Hayami), couldn't bear the weight and involuntarily relied on Konoro Aida (Yuta Hiraoka). Yui asks Aida's pet dog Snoop to play in a dog run while listening to her complicated chest. There, Aida receives news of an emergency. Aida rushes to the hospital and Yui takes care of Snoop. That night, Aida appears in Yui's apartment to pick up Snoop. At the moment of opening the entrance, Aida suddenly "floor don" Yui ...! ?? On the other hand, abandoned man Yuuki (Sho Kasamatsu) appears in front of Sae Mishima (Michiko Tanaka) who continues to make intense motions on Amagi. Sae who treats the former playmate coldly. That action causes a terrible disaster! !!
